Issued:
2021-01-19
Updated:
2021-01-19

RHSA-2021:0153 - Moderate: dnsmasq security update

Synopsis

Moderate: dnsmasq security update

Type/Severity

Security Advisory Moderate

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)

  • dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)

  • dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for Scientific Computing7x86_64
Red Hat Enterprise Linux for Power, little endian7ppc64le
Red Hat Enterprise Linux for Power, big endian7ppc64
Red Hat Enterprise Linux for IBM z Systems7s390x
Red Hat Enterprise Linux Workstation7x86_64
Red Hat Enterprise Linux Server7x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support7x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian7ppc64le
Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian7ppc64
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)7s390x
Red Hat Enterprise Linux Desktop7x86_64

Updated Packages

  • dnsmasq-utils-2.76-16.el7_9.1.s390x.rpm
  • dnsmasq-utils-2.76-16.el7_9.1.ppc64le.rpm
  • dnsmasq-debuginfo-2.76-16.el7_9.1.s390x.rpm
  • dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm
  • dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm
  • dnsmasq-2.76-16.el7_9.1.src.rpm
  • dnsmasq-2.76-16.el7_9.1.ppc64.rpm
  • dnsmasq-2.76-16.el7_9.1.ppc64le.rpm
  • dnsmasq-2.76-16.el7_9.1.s390x.rpm
  • dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm
  • dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm
  • dnsmasq-2.76-16.el7_9.1.x86_64.rpm
  • dnsmasq-utils-2.76-16.el7_9.1.ppc64.rpm

Fixes

CVEs

References

Additional information